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<br />SPRING & POND 20 Mg, (Dissolved) <br />r. <br />30 <br />25 <br />20 <br />mg/1 15 <br />10 <br />5 <br />0 <br /> <br />^ MIN. <br />^ MEAN <br />^ MAX. <br /> <br />1987 1986 1985 1984 1983 <br />